Collapsible form



L. (LILAMKlN AND J. H. BERGHAus, 1n.

COLLAPSIBLE FORM.

APPLICATION FILED DEC. 5 i918.

` ,327,333,l Patented Jan. 6,1920. l

ZSHEETS-SHEET I.

IN VEN TOHS iiNiTEn sTATEs PATENT orrioii.

LORENZO 0. LAIVIKIN AND JOHN H. BERG-HAUS, JR., OF LOUISVILLE, KENTUCKY.

cOLLArsIB'LE FORM.

Specificationl of Letters-Patent.

Patented Jan. 6, 1920.

Application led December 6, 1918. Serial No. 265,622. i

of a character adapted for use in the art ofpaper box making, and more particularly adapted to be used in connection with an ending machine, although it may be found serviceable in other connections. A

In a certain style of paper box, the bottom and sides thereof are formed from one sheet, the ends being affixed to flanges which are turned inward from the ends and sides. In order to insure adhesion and hasten the setting of the adhesive, great pressure is applied to the flanges and superimposed end pieces. The method being, for the operator to place a blank, the parts of which are delimited by score lines, against the end of a form, the width of which is the same as that of the interior of the box to be formed and the length thereof equal to, orgreater than that of the depth of the box to be formed. lith the palm of the hand, the sides are bent back on the scored lines, to lie against the sides of the form and the flanges. are bent down, with the thumbs and fore fingers, to lie on top of the form. The box end is then positioned on the flanges. The form is carried on amoving part of a press, which when released by means of a foot lever carries the form against a head, whereby great pressure is exerted upon the end and flanges in place on the form. If the operator does not exercise duel precaution, his thumb or fingers will be caught and crushed between the advancing form and the head of the press.

An object of this invention is to provide a form adapted to be used for the purpose set forth above, the walls of which will yield or collapse, if the operators fingers or thumb, or any other obstruction should be interposed between the top of the form and the head of the press. l

llith the foregoing and other objects in view, the invention consists of the novel construction and arrangement of parts illustrated in the accompanying drawing, which forms a part of this specification, wherein is set forth an embodiment of the invention,

but it is to be understood thatl such changes and modifications may be resorted to as come within the scope of the appendedclaims.

In the drawings, comprising two sheets, wherein similar reference characters designate like parts in the several views, Figure l, is a perspective View of an embodiment of theinvention: Fig. 2, an elevation of the lrear end thereof, the fixed head and the movable bed ofthe press being indicated `by dotted lines: Fig. 3, a top plan view,

some parts being removed, some broken away and others in section, the better to show thel construction, one locking element being shown in a normal position and the other in operated position: Fig. 4, a section on line 4 4 of Fig. 3: Fig.' 5, a section on line 5-5 of Fig. 3: Fig. 6, a perspective view of one of the locking tumblers showing the underside thereof: Fig. 7, a perspective view of an end wall showing theinner face thereof and Fig. 8, a plan view of a blank of the style referred to.

The embodiment of the invention illustrated herewith comprises a rectangular base -10- on the under side of which is a loiigitioning the form on the bed -8-'- of a press in connection with which it is to be used. On the upper side of the base is a centrally positioned longitudinal rib --12- which eX- tends a spaced distance forward from the rear end thereof and a block'-13- positioned a spaced distance from the forward end of the base and in alinemeiit with the rib 12. A pair of skeleton frames are disposed on either side respectively of the central rib and are adapted to be shifted transversely on the base. These frames are identical except that one is right hand and one is left hand. Each comprises a Stringer -15 which lies parallel with the rib and extends from the rear end of the base to within a spaced distance of the forward end thereof. A right and left handed screw T164,- arranged transversely of the base is engaged in projections .-171- which depend from the stringers 15, and move in a groove -'-18- in the base. It is clear that turni-ng the screw will advance and withdraw the frames and their associated elements from and to the center of the base, thus adapting tioned on the base. An angular' extension, or arm -20- at the rear end of the stringer parallels the end of the base and a post -22- is erected vertically on the free end of this arm. Normally the post stands over the rear corner of the base. From the forward end of 'the stringer a curved arm 23- lextends outward and forward and supports a post 24 over the forward corner of the base. The posts 22 and 24 are provided on their opposed sides with grooves 26- in which are disposed sliding` blocks -27- which are upheld by means of springs -2-. The rear posts 22, extend the full height of the frame but the forward posts terminate a spaced distance therefrom, being only of such height as is necessary to accommodate the blocks 27. A side wall, or wing -30- is pivotally mounted in the blocks 27 by means of gudgeons --31--. The upper edge of this wall is normally fiush with the top of the rear post and the lower edge is a spaced distance above the base. rlhe springs 28 permit the wall t0 be depressed, and their tension is such that if a finger is caught between the top of the wall and the head of the press, they will yield without hurting the finger. The lower forward corner of the wall is cut away to adapt it to fit over the curved arm 23, when the wall is depressed. A plate -33- secured to the forward side of the front post 24, by screws -34- extends a spaced distance therefrom and is provided on its inner edge with an inturned flange -35- which parallels the post. An end wall m36- has a tongue 3T-- on its outer edge, which slidably received in a vertical groove B8-- in the front post 24, and is provided on its face with. a groove -39- for the reception of the flange 35, on the plate. By this construction the end wall is rigidly associated with the post and is freely movable relative thereto in a vertical plane. A spring pressed plunger 40- disposed in a vertical bore -41- extends downward therefrom with its lower end resting on the base, and serves to yieldingly maintain the wall in its nor mal position, that is with its upper edge iush with that of the side walls. An arm 43W- extended from the end wall overhangs the front post 24 and is spaced thereabove, the distance through which the end wall may be depressed. A recess, or notch 44- on the inner side of this arm near the outer end thereof, is adapted to receive a pin, or projection -45- on the forward end of the side wall, 30, whereby normally the side wall is retained in a vertical position, also if the end wall is depressed it will carry the side wall with it. A slight depression of the side wall will free the pin, 45, from the notch 44, when the top of the wall will naturally, under the pressure of the operators hand, swing inward, there being a recess -46- on the inner face of the end wall which provides a path for the pin. It will be observed that the side walls may be depressed bodily against the tension of the springs 28, that they may be turned on the horizontal pivots 31, when the pins 45 are clear of the notches 44, and that there is sufficient clearance between the ends of the side walls and the respective posts to permit of their depression, without danger of binding by pressure on either end thereof, so that depression of an end wall will depress the adjacent end of its associated side wall. The tension of the springs, which uphold the walls, is such that they will not yield under the weight of the operators hand nor by reason of the necessary manipulation attending the placing of a blank, but if a digit is caught between the upper edge of the form and the head 9- of the press they will yield without exerting pressure sufficient to injure the trapped member. The pressure normally exerted by an operators fingers in positioning a blank is di rected inward against the upper edges of the walls and in event the pin 45, is released from the notch 44, tends to swing the wall inward as described. now be described, by means of which the walls are locked in position and adapted to sustain the pressure necessary to attach the end of the box, Upon the upper side of the stringer of each of the skeleton frames, a bar -50- is slidably mounted, being retained by means of screws 51- which pass through slots 52 into the stringer. The bar 50 extends from a point a spaced distance from the forward end of the Stringer to a spaced distance beyond the rear end thereof and is provided with a slot 53- in the extended portion. A bracket --54-a secured to the arm 20, depends therefrom to the lower edge of the base. A shaft -55- mounted in bearings -56-, carried by the bracket is provided on its inner end with a vertical arm *57* which is engaged in the slot 53, in the sliding bar 50, and on its outer end with an arm -58- which is operatively connected with a vertical rod 59- which is slidably mounted in brackets 6G- which are attached to the post 22. The rod extends above the post a spaced distance less than the thickness of the digits of an operators hand, the arrangement being such that as the form approaches the head of the press, the rods 59 will be depressed and the sliding bar thereby drawn backward. A locking bolt 61- located on the base forward of the curved arm 23, in substantial alinement with the stringer, and guided by a rib -62- is adapted to be pushed forward under the edge of the front wall. A link -63- operatively connects the block with lever #@44- which is fnlcrmued, on the The mechanism willV stringer at -65-. The other end of the lever 64 is connected with the sliding bar by means of a coil spring 66-, the tension of which is such that normally retraction of the bar will advance the bolt under the end wall and prevent depression thereof, but should the wall have been depressed before the bar is actuated and forward movement of the bolt be prevented by contact therewith, the spring 66, will yield and permit the movement of the bar to proceed without detriment to the structure. The sliding bar and associated elements are returned to normal position by means of a spring -67-. A rod -68- inclosed within the coiled spring 66, enables the sliding bar to exert a direct push on the lever 6st to return the bolt to normal position. A locking tumbler -70-, positioned on the base longitudinally, and movable transversely thereon, is provided on its lower surface with a groove -72- which fits over the screw 16, and with grooves 78- which seat on the ribs 19', by which it is guided in its movement, a projecting portion -75- overhanging the Stringer. A plurality of triangular projections -76- extended from the outer edge of the sliding bar, have upturned iianges -77- on their longer sides, which are disposed at a suitable angle to the bar. These flanges are received in corresponding grooves 78- in the under surface of the overhang 75. The arrangement being such that as the bar is drawn back, the tumbler will, by action of the flanges, 77, in the grooves 78, be forced outward under the side wall and will effectively prevent any movement thereofA either vertical or rotary. Should a digit, as it is being withdrawn, be caught between an approaching pressure element and the upper' edge of a vside wall, 30, the wall will be partially depressed, its lower edge moving into the outward path of a tumbler 70,l

which as it is moved outward will push thereagainst, thereby swinging the wall on its pivots and releasing the digit. Return of the bar, under stress of the spring 67, withdraws the tumbler from under the wall. Hovemcnt of the end walls being blocked by the locking bolts 61, and of the side walls by the tumblers 70, pressure may now be exerted upon them the same as if they were normally rigid. A floor -80- which is placed over the mechanism rests upon the pressure, means positioned on said base and engageable with said walls to prevent them from yielding, said means adapted to be actuated by said pressure element upon its approximation to the walls.

2. In combination with pressure applying elements, a form as characterized, comprising a base, a wall yieldingly supported thereon, a locking element on said base adapted to be engaged with said wall to prevent yielding thereof said element adapted to be actuated by an approaching pressure applying element.

3. In a form as characterized, a base, walls' yieldingly supported thereon, locking elements adapted to be engaged with said walls to prevent movement thereof, actuating means operatively connected with said elements and extending a spaced distance above the walls.

4. In a form as characterized, a base, parallel side walls and an end wall suitably supported thereon and adapted to be depressed perpendicularly relative thereto, locking elements disposed on said base and adapted to be projected under said walls to prevent depression thereof.

5. In a form as characterized, a base, posts erected on said base, walls yieldingly supported between said posts and locking elements positioned on the base and adapted to be engaged with said walls to prevent yielding thereof.

6. A form comprising a base, posts erected thereon, walls positioned between said posts and movable vertically relative thereto, the lower edge of said walls being a spaced distance above said base, resilient means opposing the downward movement of the walls, locking elements disposed on the base and adapted to be projected under the walls to prevent downward movement thereof, actuating means operatively connected with said locking elements and operating means connected with said actuating means and eX- tending a spaced distance above the posts.

7. A form as characterized, comprising a base, posts erected thereon, side walls pivotally mounted between said posts and adapted for vertical and rotary movement relative thereto, said walls terminating a spaced distance above the base, resilient means opposing downward movement thereof, locking elements disposed on the base and adapted to be projected under the walls to prevent downward movement thereof, actuating means operatively connected with said locking elements and operating means connected with said actuating means and extending a spaced distance above the posts.

8. A form as characterized comprising a base, posts erected on the corners thereof, the front and rear posts respectively having vertical slots in their opposed sides, blocks slidalbly disposed in said slots, springs Vtance above the posts.

adapted to hold said blocks at the upper end of the slots, side walls pivotally mounted in the blocks, locking elements disposed on the base andadapted to be projected under the walls to prevent downward movement thereof, actuating lmeans operatively connected with said locking elements and operating means connected with said actuating means and extending a spaced distance above the posts.

9. A form as characterized comprising a base, posts erected on the corners thereof, the front and rear posts respectively having vertical slots in their opposed sides, blocks slidably disposed in said slots, springs adapted to hold said blocks at the upper end of the slots, side walls pivotally mounted in the blocks, an end wall slidably associated with a front post, resilient means adapted to hold said end wall at its upper limit of movement, interengaging means'between the end wall and the adjacent side wall whereby depression of the end wall will cause a corresponding` depression of the side wall but which will permit independent depression of the side wall, locking elements disposed on the base and adapted to be projected under the walls to prevent downward movement thereof, actuating means operatively connected with said locking elements and operating means connected with said actuating means and extending a spaced dis- 10. A form as characterized a base, posts erected on the corners thereof, the front and rear posts respectively having vertical slots in their opposed sides, blocks slidably disposed in said slots, springs adapted tohold said blocks at the upper end of the slots, side walls pivotally mounted in the blocks, an end wall slidably associated with a front post, resilient means adapted to hold said end wall at its upper limit of movement, interengagable means between the end walls and the adjacent side wall ywhich prevents rotary movement of the side wall without first depressing it slightly to free it from engagement with the end wall but whereby primary depression of the end will carry the side wall with it.

11. A form as characterized comprising a base, posts erected on the corners thereof, the front and rear posts respectively having vertical slots in their opposed sides7 blocks slidably disposed in said slots, springs adapted to hold said blocks at the upper end of the slots, side walls pivotally mounted in the blocks, an end wall slidably associated with a front post, resilient means adapted to hold said end wall at its upper limit of movement, interengageable means between the end walls and the yadjacent side wall which prevents rotary movement of the side wall without first depressing it slightly to free it fram engagement with the wah but whereby primary depression of the end will carry the side wall with it, locking elements disposed on the base and adapted to be projected under the walls to preventl downward movement thereof, and actuating means operating with said locking means and operating means connected with said actuating means and extending a spaced distance above the posts.

12. A form as characterized, comprising a base, posts erected thereon, walls positioned between said posts and movable vertically relative thereto, the lower edge of said walls being a spaced distance above the ba-se, resilient means adapted to hold the walls at the upper limit of their movement, a bar slidably positioned longitudinally on the base, a rod slidably mounted on the reail post and extended a spaced distance thereabove, operative connections between said rod and said bar whereby depression of the rod will move the bar, resilient means adapted to return the bar and rod to normal position, locking elements adapted to be en- Y gaged with the walls to prevent de ression thereof, and operative connections etween said elements and the sliding bar.

13. A form as characterized comprising a base, posts erected 0n the corners thereof, the front and rear posts respectively having vertical slots'in their opposed sides, blocks slidably disposed in said slots, springs adapted to hold said blocks at the upper end of the slots, side walls pivotally mounted in the blocks, a` bar slidably positioned longitudinally on the base, a rod slidably mounted on a rear post and extended al spaced distance thereabove, operative connections between said rod and said bar, whereby depression of the rod will move the bar, resilient means adapted to return the bar and rod to normal position, locking elements adapted to be engaged with the walls to prevent depression thereof, and operative connections between said elements and the sliding bar. i

lll. A form as characterized comprising a base, posts erected on the corners thereof, the front and rear posts respectively having vertical slots in their opposed sides, blocks slidably disposed in said slots, springs adapted to hold said blocks at the upper end of the slots, side walls pivotally mounted in the blocks, an end wall slidably associated with a front post, resilient means adapted to hold said end wall at its upper limit of movement, interengaging means between nections between said rod and said bar, whereby depression of the rod will move the bar, resilient means adapted to return the bar and rod to normal position, locking elements adapted to be engaged with the walls to prevent depression thereof and operative connections between said elements and the sliding bar. f

15. A form as characterized, comprising a base, posts erected on the corners thereof, the front and rear posts respectively having vertical slots in their opposed sides, blocks slidably disposed in said slots, springs adapted to hold said blocks at the upper end of the slots, side walls pivotally mounted in the blocks, an end wall slidably associated with a front post, resilient means adapted to hold said end wall at its upper limit of movement, interenga-ging mea-ns between the end wall and the adjacent side wall which prevents rotary movement of the side wall without rst depressing it slightly to free it from engagement with the end wall but whereby primary depression of the end will carry the side wall with it, a bar slidably positioned longitudinally on the base, a rod slidably mounted on a rear post and extended a spaced distance thereabove, operative connections between said rod and said bar whereby depression of the rod will move the bar, resilient means adapted to return the bar and rod to normal position, locking elements adapted to be engaged with the walls to prevent depression thereof, and op erative connections between said elements and the sliding bar. Y u

'16. A form as described, comprising a base, posts erected on the rear corners thereof, other posts of less height erected on the front corners, the front and rear posts on the respective sides having vertical slots in their opposed sides, spring supported blocks slidably mounted in said slots, side Walls pivotally mounted in said bloclzs, the front posts having vertical grooves in their opposed sides, an end wall slidably mounted in said grooves, resilient means adapted normally to hold said end wall at the upper limit of its movement, interengaging means between the end and side walls whereby a side wall may be depressed independent of the end wall, but depression of the end wall will carry the side wall with it and means adapted to lock the walls in their elevated position. v

17. A form as described, comprising a base, posts erected on the rear corners thereof, other posts of less height erected on the front corners, the front and rear posts on the respective sides having vertical slots in their opposed sides, spring supported blocks slidably mounted in said slots, side walls pivotally mounted in said blocks, the front posts having vertical grooves in their op.

posed sides, an end wall sli'dably mounted Vin said grooves, resilient means adapted normally to hold said end wall at the upper limit of its movement, interengaging means between the end and side walls whereby a side wall may be depressed independent of the end wall but depression of the end wall will carry the side wall with it, a bar slidably positioned on the base, a rod slidably mounted on the rear post and extended a spaced distance thereabove, operative connections between said rod and said bar whereby depression of the rod will move the bar, resilient means adapted to return the bar and rod to normal position, locking elements adapted to be engaged with the walls to pr vent depression thereof and operative connections between said elements and the sliding bar.

18. In a device as characterized, a base, a pair of independent elements positioned thereon, and adapted to be shifted transversely thereof, each of said elementsA comprising a Stringer, an arm extended from each end thereof, a post erected on the end l of the rear arm, a shorter post erected on the end of the front arm, said posts having vertical slots in their opposed sides, spring supported blocks slidably positioned in said slots, a side wall pivotally mounted in said blocks, an end wall slidably associated with the front post, resilient means adapted to hold said end wall at the upper limit of its movement, interengaging means between said end wall and the end of the adjacent side wall whereby depression of the end wall will depress the side wall but which will allow the side wall to be depressed independently, a bar slidably positionedlongituolinally on the Stringer, a rod slidably mounted vertically on the rear post and extended a. spaced distance thereabove, operative connections between said bar and rod whereby depression of the rod will draw the bar backward, a Spring adapted to return the bar, locking elements adapted to be moved under the walls to prevent depression thereof and operative connections between said elements and the bar.

19. In a device as characterized, a base, a work supporting member erected thereon and resiliently supported a spaced distance thereabove and an element movable to a position under said member to rigidly uphold same.

20. In combination with pressure applying elements, a device as characterized, comprising a base, work supporting member erected thereon and adapted to yield upon the premature application of pressure thereto, an element associated with said base and adapted to be engaged with said member to prevent its yielding, said element adapted to be actuated by pressure exerting means upon its approximation to said member.

21. In combination with pressure apply- V tion to the form to prevent the supporting member from yielding.

22. In a form as characterized, a base, Walls supported thereon and'adapted to normally yield under pressure and a member positioned on said base and movable into engagement with said Walls to prevent depression thereof.

23. In a form as characterized, a base, Walls yieldingly supported thereon, means adapted to prevent yielding of said Walls, and actuating means operatively connected with said preventive means and extending a spaced distance above thewalls.

24. In a form as characterized, a base, posts erected on said base, Walls yieldingly supported between said posts, locking elements adapted to be engaged with said Walls to prevent movement thereof and actuating means operatively connected With said locking elements and adapted to be actuated by an approximating pressure.

25. In combination With pressure apply ing elements, a form as characterized, coniprising a base, Walls erected thereon, perpendicularly thereto and adapted to turn on a horizontal axis When subjected to premature pressure, and means adapted to prevent said turning movement, said means adapted to be actuated by a pressure applying element upon its approximation to the form.

'26. In combination With pressure applying elements, a forni as characterized, comprising a base, spaced parallel Walls erected thereon and adapted to turn upon a longitudinal axis When subjected to premature pressure, and means operatable by a proximating pressure element to prevent said turning.

27. In a form as characterized, a base,

spaced parallel Walls, horizontally disposed pivots on which said Walls are mounted and are adapted to turn under prematurely applied pressure, and means operatable at a predetermined time to prevent said turning.

28. In a form as characterized, a base, adjustably spaced parallel Walls, horizontally disposed pivots on which said Walls are mounted and are adapted to turn under prematurely applied pressure, and means operatable at a predetermined time to prevent said turning.v

29. In a form as characterized, a base, adjustably spaced parallel Walls, horizontally disposed resiliently supported pivots on which said Walls are mounted and are adapted to turn under prematurely applied pressure and means operatable at a predetermined time to prevent said turning.

30. In a form as characterized, spaced side Walls and an end Wall, said Walls being so constructed and arranged that a side Wall 'may be depressed Without influencing either of the other Walls, but that depression of the end Wall Will carry with it the contiguous ends of the side Walls.

31. In a form as characterized, adjustably spaced side Walls, and an end Wall, said Walls being so arranged and constructed that a side Wall may be depressed Without influencing either of the other Walls, but that depression of the end Wall will carry with it the contiguous ends of the side Walls.

32. In a form as characterized, adjustably spaced side Walls, and an end Wall, said Walls being resiliently supported, and so constructed andy arranged that a side Wall may be depressed Without iniuencing either of the other Walls, but that depression of the end Wall Will carry With it the contiguous ends of the side Walls.

33. A form as characterized, comprising adjustably spaced resiliently supported side Walls, and an end Wall, said end Wall com prisingl two sections each of Which is resiliently supported, the construction and arrangement being` such that either section may be depressed independent or the other and that when depressed it will carry with it the contiguous end of the respective side, and that either side may be depressed inden pendent of its respective end section.

34. A form as characterized, comprising adjustably. spaced side Walls carried on resiliently supported pivots and a resiliently supported endv Wall, the arrangement and construction being such that a side Wall may be depressed, or turned on its pivot, or both, independent of the end Wall, but that depression o the end Wall Will cause depression of the adjoining ends of the side Walls.

A form as characterized, comprising adjustably spaced side Walls carried on resilientl'y supported pivots, and an end Wall comprising two sections each of Which is reslliently supported, the construction and arrangement being such that a side Wall may bedepressed or turned on its pivot, or both, independent of the end Wall, but that depression of either section yof the end Wall Will cause depression of the adjoining end Vof the respective side Wall.

end wall will carry with it the contiguous ends of the side walls, and means operata'ble at a predetermined time to prevent depression of said walls.

37. In a form as characterized, adjustably spaced side Walls, and an end wall, said walls being so constructed and arranged that a side wall may be depressed without inuencing either of the other walls, but that depression of the end wall will carry with it the contiguous ends of the side Walls, and means operatable at a predetermined time to prevent depression of said walls.

38. In a form as characterized, adjustable spaced side Walls, and an end Wall, saidwall being resiliently supported and so constructed and arranged that a side Wall may be depressed without iniiuencing either of the other walls, but that depression of the end Wall will carry with it the contiguous ends of the side walls, and means operatable at a predetermined time to prevent depression of said Walls.

39. A form as characterized, comprisilng` adjustably spaced resiliently supported side walls, an end Lwall comprising two sections each of which is resiliently supported, the construction and arrangement being such that either section may be depressed independent of the other and that it will carry with it the contiguous end of the respective side and that either side may be depressed independent of its respective end section, and means operatable at a predetermined time to prevent depression of said Walls.

40. A form as characterized, comprising adjustably spaced side Walls carried on resiliently supported pivots, a resiliently supported end Wall, the construction and arrangement being such that a side Wall may be depressed, or turned on its pivot, or both, independent of the end Wall, but that depression ofthe end Wall will cause depression of the adjoining ends of the side walls, and means operatable at a predetermined time to prevent depression of the side Walls.

el. A form as characterized comprisingy adjustably spaced side walls carried on resiliently supported pivots, an end wall com-4 prising two sections, each of which is resiliently supported, the construction and arrangement being suoli that a side wall may be depressed, or turned on its pivot, or both, independent of the end wall, but that depression of either section of the end wall will cause depression of the adjoining end of the respective side wall, and means operatable at a predetermined time to prevent depression of said side wall.V

42. In a form as characterized, a base, a frame slidably disposed thereon and adapted to be adjusted laterally thereon to and from the center thereof, a Work supporting member carried by said frame, said member being adapted to yield under prematurely applied pressure, and means adapted to be actuated Vby an approximating pressure element to prevent the members yielding.

43. In a form as characterized, a base, a frame slidably disposed thereon and adapted to be adjusted laterally to and from the center thereof, posts erected on said frame, a wall positioned between said posts and movable vertically relative thereto, the lower edge of said wall being a spaced distance above said base, resilient means opposing the downward movement of the Wall, a locking element disposed on'the base and adapted to be projected under the Wall to prevent downward movement thereof, act-uf ating meansoperatively connected with said locking element and operating means connected With saidl actuating means and eX- tendinga spaced distance above the posts.

44;. In a'forni as characterized, a base, a frame slidably disposed thereon and adapted to bel adjusted laterally to and from the center thereof, posts erected on said frame, a side Wall pivotally mounted between said posts and adapted for vertical and rotary movement relative thereto, said Wall termi* nating a spaced distance abovey the base, resilient means opposing the downwardV movement thereof, a locking clement disposed on the base and adapted to be projected under the Wall to prevent downward movement thereof, actuating means operatively connected with said locking element and operating means connected with said actuating means and extended a spaced distance abovey the post.

45. In a form as characterized, a base, a frame slidably disposed thereon and adapted to be adjusted laterally to and from the center thereof, posts erected on said frame having vertical slots in their,v opposed sides, blocks slidably disposed in said slots, springs adapted to hold said blocks at V4the upper end of the slots, a wall pivotally mounted in the blocks, a locking element, disposed on the base and adapted to be projected under the wall to prevent downward movement thereof, actuating means opera.

tively connected with said locking elements and operating means connected with said actuating means and extending a spaced distance above the posts.

46. In a form as characterized, a base, a frame slidably disposed thereon and adapted to bey adjusted laterally to and from the center thereof, posts erected on said frame, having vertical slots in their opposed sides, blocks slidablydisposed in said slots, springs adapted to hold said blocks at the upper end of said slots, a side wall pivotally mounted in the blocks, an end wall slidably associated with the front post, resilient means adapted' to hold said end Wall at its upper limit of movement, interengageable means between the end wall and the Vadjaiso lso

cent end of the side wall whereby depression .of the end wall will cause a corresponding depression of the side wall, locking elements disposed on the base and adapted to be projected under the walls to prevent downward movement thereof, actuating means operatively connected with said locking elements and operating means connected with said actuating means and extending as aced distance above the posts.

4 In a forni as characterized, a base, a frame slidably disposed thereon 'and adapted to be adjusted laterally to and from the center thereof, posts erected on said frame 'having vertical slots in their opposed sides,

bloclrg slidably disposed in said slots, springs adapted to hold said blocks at the upper end of the slots, a side wall pivotally mountedin the blocks, an end wall slidably associated with the front post, resilient means adapted to hold said end wall at its upper limit of movement, intereiigageable means between the end wall and the adjacent end of lthe side wall which prevents iotary movement of the side wall and without first depressing it slightly to free it from engagement with the eiid-wall but whereby primary depression of the end will carry the side wall with it.

48. In a forni as characterized, a base, a frame slidably disposed thereon and adapted to be adjusted laterally to and from the center thereof, posts erected on said frame, a wall positioned between said posts and movable vertically relative thereto, the lower edge of said vwall being a spaced distance above the base, resilient means adapted to hold'the wall at the upper limit of its movement, a bar slidably positioned longitudinally on-the base, a rod slidably mounted on the rear post and extended a spaced distance thereabove, operative connections between said rod and said bar whereby depression of the rod will move the bar, resilient means adapted to return the bar and rod to normal position, locking elements adapted to be engaged with the walls to prevent depression thereof, and operative connections between said elements and the sliding bar.

a9. In a forni as characterized, a base, a pair of frames slidably disposed thereon and adapted'to be adjusted laterally to and from the center thereof, posts erected on the rear corners of said frames, other posts of less height erected on the front corners, the front and rear posts on the respective sides havin-g vertical slots in their opposed sides, spi-infrv supported blocks slidably mounted in said s ots, said side walls pivotally mounted in said blocks, the front posts having vertical grooves, in their opposed sides, an end wall slidably mounted in said grooves, resilient means adapted normally tol hold said end wall at the upper limit of its movement,

' pair of frames slidably disposed thereon and adapted to be adjusted laterally thereon to and from the center thereof, work supporting members carried by each of said frames, said members being adapted to yield under prematurely applied pressure, and means adapted to be actuated by an approximating pressure element to prevent the members yielding. i

51. In a forni as characterized, a base, a

pair of frames slidably disposed thereon and adapted to be adjusted laterally to and from the center thereof, posts erected on said frames, side walls pivotally mounted between said posts and adapted for vertical and `rotary movement relative thereto, said walls terminating a spaced distance above the base, resilient means opposing downward movement thereof, locking elements disposed on the base and adapted to be proj ected under the walls to prevent downward movement thereof, actuating means operatively connected with said locking elements and operating means connected with said actuating means and extended a spaced distance above the posts.

In a forni as characterized, a base, a pair of frames slidably disposed thereupon and adapted to be adjusted laterally to and from the center thereof, posts erected on the corners of said frames, the front and rear posts respectively having vertical slots in their opposed sides, blocks slidably disposed in said slots, springs adapted to hold said bloclrs at the upper end lof the slots, side walls pivotally mounted in the blocks, locking elements disposed on the base and adapted to be projected under the walls to prevent downward movement thereof, actuating means operatively connected with said locking elements and operating means connected with said actuating means and extending a spaced distance above the posts.

53. In a form as characterized, a base, a pair of frames slidably disposed thereupon and adapted to be adjusted laterallyto Yand from the center thereof, posts erected on thev corners of said fra-mes, the front and rear posts respectively having vertical slots in their opposed sides, 'blocks slidably disposed in Asaid slot, springs adapted to hold said blocks at the upper end of said slots, side walls pivot-ally mounted in the blocks, an

'endwall slidably associated with theV front posts, resilient means adapted to hold said end wall at its upper limit of movement, interengaging means between the end wall and the adjacent ends of the side walls whereby depression of the end wall will cause a corresponding depression of the side walls, locking elements disposed on the base and adapted to be projected under the walls to prevent downward movement thereof, ac tuating means operatively connected with said locking elements and operating means connected with said actuating means and extendingl a spaced distance above the posts.

54. In a form as characterized, a base, a pair of frames slidably disposed thereupon, and adapted to be adjusted laterally to and from the center thereof, posts erected on the corners oi' said frames, the front and rear posts respectively having vertical slots in their opposed sides, blocks slidably disposed in said slots, springs adapted to hold said blocks at the upper end of said slots, side walls pivotally mounted in the blocks, an end wall slidably associated with the front posts, resilient means adapted to hold said end wall at its upper limit of movement, and interengagable means between the end walls and the adjacent ends of the sidewalls which prevent rotary movement of a side wall and without first depressing it slightly to free it from engagement with the end wall but whereby primary depression of the end will carry the side walls with it.

55. In a form as characterized, a base, a pair of frames slidably disposed thereon and adapted to be adjusted laterally to and from the center thereof, posts erected on said frames, walls positioned between said posts and movable vertically relative thereto, the lower edge of said walls being spaced a distance above the base, resilient means adapted to hold the walls at the upper limit of movement, a bar slidably positioned longitudinally on the base, a rod slidably mounted on the rear post and extended a spaced distance thereabove, operative connections between said rod and said bar whereby depression of the rod will move the bar, resilient means adapted to return the'bar and rod to normal position, locking elements adapted to be en- 7 gaged with the 'walls to prevent depression thereof, and operative connections between said elements and the sliding bar.

56. In a form as characterized, a base, side and end walls suitably supported thereon, said walls adapted normally to yield ver* tically under moderate pressure, means for applying pressure vertically to said walls, and means to prevent depression of the walls under pressure, the last named means adapted to be actuated by the rst named means upon its close approximation to the top of the walls.

LORENZO O. LAMKIN. JOHN HL BERGHAUS, JR. 

